suport minify option in filter using jstransformer

[pirxpilot]

There are several advantages of that approach:

• the code is simpler - no need to worry about specifics of minimizing
• makes replacing the minimizers - if we ever need to do that - trivial
• pug does not have to worry about keeping its dependencies on uglify-js and clean-css current
• users who want to use alternative minimizers do not bear the cost of installing uglify-js and clean-css

The only drawback I can think of is that it requires pug users to explicitly install jstransformer-uglify-js or/and jstransformer-clean-css if they want to use minify option.

[ForbesLindesay]

This will need a major release, but I see no reason not to go ahead with it.

[rollingversions]

pug (2.0.4 → 3.0.0)

Breaking Changes

• The minify option on filters now requires you to install the relevant jstransformer

  Currently we support:

  • jstransformer-uglify-js for JavaScript
  • jstransformer-clean-css for CSS

pug-filters (3.1.1 → 4.0.0)

Breaking Changes

• The minify option on filters now requires you to install the relevant jstransformer

  Currently we support:

  • jstransformer-uglify-js for JavaScript
  • jstransformer-clean-css for CSS

Packages With No Changes

The following packages have no user facing changes, so won't be released:

• pug-attrs
• pug-code-gen
• pug-error
• pug-lexer
• pug-linker
• pug-load
• pug-monorepo
• pug-parser
• pug-runtime
• pug-strip-comments
• pug-walk

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